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QIm. on Su«m»r Bird* of Mountain 
j?ors. Picfcaua Go, 3.C. L.M. Loomis. 
56. Dendroica virens. Black-throated Green Warbler. — I was 
much surprised to find that the Black-throated Green Warbler was a very 
common bird at the foot of the mountains, as well as over the higher 
slopes. Its peculiar song, which was uttered with unfailing emphasis dur- 
ing the entire month of June, rendered it one of the more prominent 
choristers of the woodland. A well-feathered bird of the year was taken 
fune 10. The testes of all examined were not larger than a small pea. 
Auk, VII. April, 1880 . p. 12 %. 
